Shadow Falling (The Scorpius Syndrome #2) by Rebecca Zanetti

Before the Scorpius Syndrome tore through North America and nearly wiped out the population, Vivienne Wellington was the FBI’s best profiler. The bacteria got her anyway. But she survived. She recovered. And when she woke up from a drug-nightmare of captivity, her skills as a hunter of men had gone from merely brilliant to full-on uncanny. Her mysterious rescuer wants her to put them to the test. But no matter how tempting he is, with his angel’s eyes and devil’s tongue, Vinnie knows she shouldn’t trust him.

If the FBI were still around they would rate Raze Shadow as one of the bad guys. His military training can’t wipe out his association with the Mercenaries, the most feared gang in a thousand miles. His loyalties are compromised. He won’t even tell Vinnie his real name. But there’s no FBI in the new America of fear and firepower, only instinct and risk. And the way his arms wrap around her tells its own story. Whatever else Raze is concealing, he can’t hide his desire . . .